Escalating costs and supply-chain challenges are squeezing major U.S. food companies, boosting food costs and hampering the flow of staples to grocery-store shelves.

Makers of french fries, ketchup and potato chips are struggling to staff processing lines and move goods across highways and ports, executives said, while costs for products as diverse as packaging and cooking oil rise. Companies including Conagra Brands Inc., CAG -0.00% PepsiCo Inc. PEP 1.69% and Lamb Weston Holdings Inc. LW -4.92% are raising prices to keep up, they said, while striving to keep products in stores.

Supply-chain problems are growing for U.S. food makers at a time consumers are spending heavily on food, in supermarkets and restaurants. Consumer spending at grocery stores was 4% higher in August than in the same month a year earlier, according to U.S. Census Bureau data. Restaurant sales have climbed this year as Covid-19 restrictions ease, though concerns over the Delta variant have eroded some of the rebound in recent weeks.

Conagra, which produces Slim Jim meat sticks, Pam cooking spray and Hunt’s ketchup, on Thursday raised its inflation projection for the year, while reporting that its quarterly profit fell 29% to $235.4 million. Executives said the Chicago-based company in recent months has faced higher costs for meat, grains and steel cans, as well as labor and transportation challenges. The company’s overall sales fell 1.1% to $2.65 billion from $2.68 billion for the quarter ended Aug. 29, a better result than the expectations of analysts polled by FactSet.

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Conagra Chief Executive Sean Connolly said the company is trying to respond to stronger-than-expected demand as consumers continue working remotely, watching movies from home and cooking their own meals more than they did before the pandemic.

“This is a great problem to have, but it increases the demands on our supply chain,” Mr. Connolly said. “It’s a daily grind.”

Lamb Weston, the top North American seller of frozen potato products, separately said Thursday that its quarterly profit fell by two-thirds to $30 million for the quarter ended Aug. 29, pressured by what the Idaho-based company called rapidly increasing transport costs, scarce labor and other disruptions, including intense summer heat that damaged potato crops in the U.S. Pacific Northwest. Executives said the french-fry supplier will increase prices to offset its rising costs, and alter production and staffing schedules to help attract and keep more workers.

“Everything we’re doing, it’s going to take time,” said Tom Werner, Lamb Weston’s CEO. For now, Mr. Werner said, labor challenges are disrupting production and making the company’s processing plants less efficient.

Other food companies are contending with similar problems. PepsiCo Inc. said earlier this week that it faces higher costs for aluminum cans, plastic bottles, labor and trucking, though the company boosted its profit expectations for the year because of rising sales of Mountain Dew, Doritos and other snacks. General Mills Inc. GIS 0.01% said last month that the Cheerios and Betty Crocker parent is dealing with hundreds of operational disruptions—such as more-expensive ingredients and a shortage of truck drivers—that are pushing up costs for supermarket customers.

To keep pace with demand, Mr. Connolly said Conagra is aggressively recruiting workers and trying to ensure that its employees stay healthy. The company is maintaining pressure on materials and ingredients suppliers and establishing contingency plans to deal with shortages, such as potentially swapping in different ingredients or finding secondary suppliers, he said.

“We’re looking for alternate solutions even if they come at a higher cost,” Mr. Connolly said in an interview.

Strong demand and supply challenges mean Conagra hasn’t been able to deliver on customer orders as fully as the company would like, executives said, though they added that they are able to fill nearly all orders. Grocers in recent months have said they have received only a portion of their orders for Conagra’s Hunt’s products. The company said demand for the products has been unprecedented, and that availability of some Hunt’s items will be low until it can package more tomatoes from this year’s harvest.

Mr. Connolly said Conagra also might reduce promotions on some items to keep demand in check and avoid exacerbating supply challenges. “We don’t need to fan the flames,” he said.

Write to Jesse Newman at [email protected]

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This post first appeared on wsj.com

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